In this episode, the Trekkers explore the world's most spectacular volcanoes, traveling from Pompeii, Stromboli and Santorini in Italy and Greece to Krakatoa and Mt. Fuji in Indonesia and Japan. Other explosive sites include Montserrat, Pacaya in Guatemala, Cotopaxi in Ecuador, La Palma in the Canary Islands, Mount St. Helens and Kilauea in the U.S. and Mont Pelee on Martinique.